Jonathan: Jonathan Ennis-King wrote: > Does anyone have experience writing parallel Java code (using MPI) with > calls to C libraries which also use MPI? Is this possible/sensible? Is > there a big performance hit relative to doing the same in C++?
Unless all of the important optimizable calculation is done in libraries that you are stitching together with Java glue, the compiled languages are likely to be quite a bit faster. There is a sizeable abstraction penalty associated with OO languages. Many of the design patterns that they encourage (object factories, inheritance chains, etc) are anathema to high performance. > I'm considering writing some parallel code to do fluid flow in porous > media, the heart of which is solving systems of sparse linear equations. > There are some good libraries in C which provide the parallel solver > (e.g. PETSC), but I'm trying to resolve which language to use for my > code. The choice is between C++ and Java, and although I'm favouring > Java at present, I'm not sure about its performance in this context. Hmmm. For this, C or Fortran may be far more appropriate. Depends upon what it is you want to do with the code. High performance using MPI depends upon many factors. If there is one particular part of the code that is better served by an OO based language, then I might suggest designing/implementing all the speed sensitive bits in a language which lets you achieve high performance, and then interfacing them to your OO language so that the OO system isn't being used for the critical time sensitive portions. > > > Jonathan Ennis-King > _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf -- Joseph Landman, Ph.D Founder and CEO Scalable Informatics LLC, email: [EMAIL PROTECTED] web : http://www.scalableinformatics.com phone: +1 734 786 8423 fax : +1 734 786 8452 or +1 866 888 3112 cell : +1 734 612 4615 _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
